Function: Alcohol test Press the "POWER" button once， the sceen will display 10 or 15 seconds count down indicating the tester enters into "warm up" mode.When the "blow" symbol displayed and 10 seconds count down started， indicating the tester is ready to test. Exhale pneuma into breath inhaler for 3-5 seconds， then read the result from the alcohol tester LCD. The "Caution" symbol will be displayed if the alcohol concentration is the level between 0.02%-0.05% BAC or 0.1mg/L-0.25mg/L BRAC. The "Danger" symbol will be displayed if the alcohol concentration is the level over 0.05% BAC Specification: Alcohol test range:0-0.19%BAC Accuracy: 0.01%BAC Warm up time: 10-15s Response time: <5s Color: white Mension: 95*36*18mmPackage included: 1 X Breathalyzer (not include the battery) 1 X User manual 1 X Strap